PPP : this stands for public private partnership as government of India definition states :

Public Private Partnership (PPP) Project means a project based on a contract or concession agreement, between a Government or statutory entity on the one side and a private sector company on the other side, for delivering an infrastructure service on payment of user charges. Private Sector Company means a company in which 51% or more of the subscribed and paid up equity is owned and controlled by a private entity.